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Does your building have those old, drafty window frames that let in cold air and jack up your heating bills? Many businesses and buildings today have ageing windows that need a revamp. The good news is that sealing those window frames on the outside can make a huge difference, and it’s easier than you think.
In this guide, we’ll walk you through everything you need to know about sealing window frames outside. From picking the right materials and tools to prepping the frames and applying sealant, we’ve got you covered. With just a few supplies and some hours to spare, you can tackle this project yourself. So grab your caulk gun, and let’s get sealing!
If you’ve noticed drafts, leaks, or an increase in your energy bills, it’s probably time to reseal your windows. The ideal time for this project is during spring, summer, or fall when temperatures are moderate enough for caulk and sealants to cure properly.
Tip: Avoid caulking if temperatures are likely to drop below freezing within 3 to 5 days of application.
To determine if your windows need resealing, inspect them closely by doing the following:
Any of these signs mean it’s time for a new caulk.
Before you start, make sure you have the following:
Resealing and weatherising your windows is an easy, low-cost way to reduce heat loss through windows and keep your place comfortable all year round. Just ensure you opt for a suitable caulk when sealing windows from outside or inside.
When sealing or caulking windows, using the proper caulk is key. Silicone caulks are highly versatile and ideal for sealing windows since they remain flexible and waterproof for many years.
For most exterior window sealing jobs, silicone caulk is your best choice for the following reasons:
For high-traffic or commercial areas, consider a silicone caulk with added durability. These caulk, often labelled as “contractor-grade,” contain additional polymers and fillers to withstand frequent movement and abrasion. Although slightly more expensive, these heavy-duty caulks will last longer in busy, four-season environments.
In some cases, a polyurethane caulk may also work well for sealing windows.
Here are its key characteristics and how it compares to silicone caulks:
In summary, high-quality silicone or polyurethane caulks are excellent choices for sealing and weatherising outside windows. With the proper caulking technique and a quality product, you’ll have a watertight seal and improved energy efficiency in no time. Now, let’s walk you through how to seal windows from the outside in a few steps.
When resealing, you’ll want to do so from both the exterior and interior.
Here is how to seal a window frame from the outside:
Before you start caulking outside windows, clean the area thoroughly to remove any dirt or debris. Use a putty knife, wire brush, or sandpaper to scrape off any loose or peeling caulk. Ensure the area is dry before applying the new sealant.
For exterior windows, choose a waterproof and weather-resistant caulk. A silicone or latex-based window seal works well for most applications. Make sure it’s compatible with the materials you’re sealing, such as wood, vinyl, or aluminium.
For interior insulating window coverings, consider acrylic latex caulk, which is water-based and less hazardous. For a long-lasting solution, look for a caulk with a warranty of 20 years or more.
Place the caulk cartridge inside the caulk gun at an angle and pull the trigger to release the plunger. Clip the tip of the caulk tube at a 45-degree angle to make a small opening. Depress the plunger or pull the trigger to fill the chamber with window seals, keeping the gun at a 45-degree angle with the tip facing up.
Keep the caulk gun at a 45-degree angle and apply steady pressure to the trigger as you guide the tip along the window trim and cracks, moving slowly for the best results. Release the trigger and pull away to form a smooth, uniform bead. For larger gaps or cracks, apply two or three thinner beads rather than one thick coat.
Use a putty knife, wet finger, or caulk smoothing tool to gently push the caulk into gaps and cracks and wipe away excess. For a neat finish, run a damp cloth along the bead to clean up any remaining residue. Allow 24 to 48 hours for the caulk to cure completely before exposing to rain or moisture.
With some patience and the proper technique, you’ll have your windows sealed tight in no time. Be sure to inspect your work and touch up any spots needing additional caulk for the best protection. This procedure is also similar to how to seal a window from the inside. While a cost-effective option, understand that there are times when resealing a window yourself might not cut it, and you may need to hire the service of a professional glazing company.
Sometimes, window caulking requires a skilled hand, especially with window frame sealing. For business owners overseeing a large building, this is definitely one of those times. A professional glazier has the right tools and knows exactly how to seal around window frames for the best and longest-lasting results.
If you’re considering resealing all the windows in your building, you’ll want someone who can handle the project’s size. Professional glazers can manage the job efficiently. They plan out the work to make sure your business keeps running smoothly without major disruptions.
Additionally, old windows might be beyond a simple fix. If the frames are too worn out, window caulk might just be a temporary patch-up, leading to higher repair bills later. A professional can inspect your windows and advise you on the best time for a full replacement, which could save you money in the long run.
GLRE has plenty of expertise in commercial glazing. We’re not just another repair company; we’re a top choice for businesses across the UK.
GLRE offers more than just resealing. We can handle glass replacements, thorough inspections, and even cladding services to keep your building looking its best. We are equipped to work at any height, which is perfect for tall office blocks or high-rise hotels.
What if something unexpectedly goes wrong? GLRE is ready to respond with emergency services to ensure your business is always protected.
Choosing GLRE means you’re opting for a stress-free solution for sealing window frames outside. We bring experience, efficiency, and excellence to every job. Your building’s windows will not just be sealed; they’ll be cared for by professionals who know the importance of both function and form. With GLRE, you can look forward to energy savings, a comfortable work environment, and the satisfaction of a job well done.
Contact us today to discuss your glazing project requirements!
The best exterior sealant for drafty windows combines durability and flexibility. Top choices include Everbuild 825 LM, Soudal Silirub LMN, Everbuild 950, Arbosil LM, and CM Sealants SFS. These sealants provide excellent weather resistance and long-lasting protection for various frame materials.
Siliconised latex sealant is the best choice for sealing outside windows. It combines acrylic latex with added silanes (silicone compounds), offering enhanced weather resistance and more robust, durable bonds. This makes it ideal for caulking exterior and interior windows as well as providing long-lasting protection against the elements.
Caulking is used to fill gaps around windows outside for small cracks. For larger gaps, a putty knife inserts an appropriately sized foam backer rod into the gap and then caulks over it. Aerosol cans of expandable foam are effective in sealing and insulating the space thoroughly for even bigger gaps and holes.
Yes, windows should be caulked on the outside as well as the inside. Professional glazers recommend this practice for older windows to ensure a thorough seal. Caulk windows on both sides to prevent air leaks and protect against moisture-related issues, safeguarding the window’s efficiency and longevity.
Sealing window frames outside is a cost-effective way to ensure an airtight seal within your building and cut down on heating bills. Just remember to prep the area, use high-quality materials, take your time, and protect yourself. While you can often handle minor resealing tasks yourself, we recommend hiring a professional glazing company if you find yourself resealing the frames more often or when working on a large project.
Contact GLRE today to discuss your window sealing projects.
